CSC/ECE 517 Summer 2008/wiki1 6 jm

Introduction

Both the Ruby and Java support Arrays as part of the language. Ruby supports Hashtables as part of the language but Java does not. In this article I will compare the use of Arrays and hashtables in Ruby and Java.

Arrays in Ruby

Creating Arrays in Ruby

Creating an array in Ruby is as simple as

  a = []

Initializing an Array in Ruby

  a = ["one",45,"hello"]

Array Comparison

Array Function	Ruby	Java
Create	h = [] or h = Array.new	todo
Initialize	h = ["one",1,"two"]	todo
Element Access	h[0]	h[0]

Hashtable Comparison

Hashtable Function	Ruby	Java
Create	h = {} or h = Hash.new	h = new Hashtable();
Initialize	h = {"key1" => "value1", "key2" => "value2" }	Not Available
Add Key to Existing Hashtable	h["key3"] = "value3"	h.put("key3",new String("value3"));
Remove a Key - Value pair	h.delete("key1")	h.remove
Check if Key Exists	h.key?("key1")	h.containsKey("key1")
Check if Value Exists	h.value?("value1")	h.contains(new String("value1"));
Retrieve a Value Given a Key	h["key1"]	h.get("key1")

External Links

Java Hastable Examples